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Enigines out of sync then back in

Posted: August 7th, 2016, 6:59 pm
by denders
Hi all - looking for a place to start with this one. We have a 1982 3396 Carver Mariner with twin 350 crusader engines. As we were coming back from a day trip all of a sudden the engine sync gauge would drift to the port side ( about 3/4 of the way ) then after a second or 2 it would come back to center. You could hear a difference in the engines so it shouldn't be just a gauge issue. This would happen every 10 or 15 minutes - The Tach's did not show a difference in RPM in either engine but given the sync was only off by a little I am not surprised. We were cruising around 7 / 7.5 knots. Any thoughts would be appreciated. As an addendum - We went out again and it the issue did not reoccur until we we out about 40 minutes or so.

Thanks in advance

Re: Enigines out of sync then back in

Posted: August 7th, 2016, 10:44 pm
by Viper
If you could hear a difference in rpm in the engines, it should have been reflected in the tach readings. Sometimes poor connections will cause this symptom or a sync gage that is on it's way out.

Re: Enigines out of sync then back in

Posted: August 8th, 2016, 10:17 am
by feeez
My Sync guage seems to have a mind of its own. Since I have had the boat I have always used the tachs and the sound of the engines as my sync. Out of curiosity, where is that sync guage connected to at the the engine end?

Fraser

Re: Enigines out of sync then back in

Posted: August 8th, 2016, 10:12 pm
by Viper
They can get piggy-backed off the tachs